Removed NioTSO client and server

- NioTSO client isn't needed because we're using RayLib
- Added FreeSO's API server to handle most backend operations

server/FSO.Server.Database/DA/Users/UserAuthenticate.cs

@@ -0,0 +1,9 @@
+namespace FSO.Server.Database.DA.Users
+{
+    public class UserAuthenticate
+    {
+        public uint user_id { get; set; }
+        public string scheme_class { get; set; }
+        public byte[] data { get; set; }
+    }
+}